Is this perpendicular or parallel?

y=5x+3 and y=-5x+8

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.